Electric wall plug



Feb. 9 ,1926. 1,572,563

H. F. SECRETAN ELECTRIC WALL PLUG Filed Sept. 19, 1923 H HIHIHI E s mMTV-S Patented Feb. 9, I926.

UNITED STATES PATENT OFFICE.

HAROLD FBEDERIC sncnnrnn, or YPELAW-ONY-TYNE, ENGLAND, ASSIGNOR To a.ammonia & COMPANY LIMITED, or HEBBUBN-ON-TYNE, DURHAM, nnenanna BRITISHCOMPANY L merald; WALL rum,

Application filed September 19, 1923 Serial Nb. 663,664.

To all whom it may concern: Be it known that I, HAROLD FREDERIOSECRETAN, a subject of the King of England, andresiding atPelaw-on-Tyne, Dur- 6 ham, in England, have invented certain new anduseful Improvements in Electric-Wall Plugs, of which the following is aspecification.

This invention relates to electric wall 1 plugs and has particularreference to plugs of the type in which the pins are surroundedby acasing preferably of metal and earthed. In order that access to the"pins and their connections may be readily obtained, according to this.invention the casing or cover is. divided say into two parts which areheld together by a screwed collar or other, easily removable fastening,thismember preferably also forming a cord P- a In one. convenientconstruction the case ing is cylindrical and is provided at one end witha cap on the inside of which. the

' insulating block holding the pins is mount ed. A tubular extensionprojects sideways from the casing, part of this tube be'ng integral withor attached to the cap and the other partintegral with the cylindricalpor- I tion. This tubular extension is screw-- 80 threaded and when'thecap is in place the two parts of the tube are engaged by a screwedcollar which holds the two portions of the casing firmly together.Conveniently the screwed collar has an internal $5 flange at its outerend serving directly or indirectly to compress a rubber gland whichsurrounds the conductors which through the tubular extension, thuscausing the gland to act as-acord grip. That 40 part of the insulatedconductor adjacent to the tubular extension may be surrounded in a wellknown way with a short length of flexible metallic tubing acting as aguard. and the screwed collar may be arranged to press the end of thismetallic tubing firmly against the rubber gland.

The cap may be provided with a recess.

containing a screw and washer or similar connection for an earthing wirewhich may W thus be sunk below the surface of the cap,

thereby protecting the hand of the operator from amage.

If desired the cap may be provided with :tion of plug according to thispass a pivoted handle so that the wall plug may be readily removed fromits socket;

In'the accompanying drawings,

Figure 1 is an elevation of one construcwith a portion broken'away, and

Figure 2 is a plan. Like letters indicate like out the drawin s. Y

A; (Fi' re 1 is a. block of insulating material in which contact pins Bare mountparts through? ed and connected to the ends of the conductorsin a flexible cable Cf Details of this block, the pins and connectionsare not shown as they may be of usual constr uction invention I and donot'inthemselves form part of the to present invention.

The metal cover or casing is in two parts, a cylindrical portion D and acap D. Thecyllndrical portion-D is provided-with an extension D in theform of a half tube and the cap D with a similar extension D.

When the two parts of the casin are as,

sembled the two half tubes, w ich are I screwthreaded, form a screwedtube which isengaged by a screwed collar E.' This collar holds the twoparts of the casing securely in position but when it is withdrawn allowsthe cap D and its extension D to be lifted off, giving ready. accesstothe block A and the connections to the fins In the example illustratedthe screwed collar E also serves as a cord grip as, when it is screwedon, it compresses a rubber washer or collar F between the end of thetube formed by the extensions D and D and the end of a short flexiblesleeve or guard G through which the cable 0 asses, the (land fit thisguard being engaged the col- In the top of the cap D is'a recess Dcontaining a washer and screw H which afto secureby Letters L endthereof, an insulatin construction may be varied, for instance the twoparts of the casing need not necessarily be secured together by means ofthey screwed collar E, some other device, such for instance as a slidingcollarfl with a'bayo-- net joint,being used for the purpose.

What I claim as m invention and desire 'atent is 2-- 1. In anelectricalattachment plug, incombination, a sleeve portion, a capclosing one block carried by said cap, contacts mounte in said block andsaid cap and sleeve in end thereof, an insulatin saidcap, contactsmounte in said block and protected by said sleeve portiion, a halftubular extension projecting radially from each said sleeve portion andsaid cap and de tachable means to engage said half tubular ,extensionsto secure the same together for the purposedescribed.

3. In an electrical attachment plug, in combination, a sleeve portion, acap for one end thereof, an insulating block carried by said cap,contacts mounted in said block and rotected by saidsleeve portion,a'half tubu ar extension projecting radially from each said sleeveportion and said cap, a conductor connected to said contacts, aprotecting sleeve thereon, and detachable means to engage and securesaid half tubular extensions together and to secure said sleeve thereto.p

In testimony whereof I have signed my name-to this specification. a

HAROLD FREDERIC SECRETAN.

